How come d becomes (delta)? after integration? I thought d and delta is the same thing. What's the difference between them?
For example,
dA = - PdV
After intergration, it becomes
(delta)A = -(integral)PdV
I can't type the symbols.
thx!
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I've taken the derivative and substituted beta and k? into it. How to make it looks like step 6?
thx!
Some misunstanding is here. Sorry about that. The answer my teacher gave is 1.56 x 10^13 V. I can't get the same answer as my teacher from the calculation above.
The anwer doesn't have unit. (This is the sample test from my teacher, he doesn't type units for answer.) But in the question, it said volts. The unit I got is Newton x Seconds/ kg. Actually, I don't know how to make it into volts. I don't even know if it's the right method. :(
The answer is 1.56 x 10^13
I can't get the answer.
Fm = F centripetal Force
qvB = mv^2/r
v= rqB/m
Calculate energy
KE = 1/2 mv^2
I put in v = rqB/m
KE= 1/2 (rqB)^2/m
I plug in all the #, but still can't the answer
please help, thanks so much!
I don't know how to answer these questions. :(
I know the alternating current makes the magnetic field changes. And the changing magnetic field generates emf.But I don't know why the emf is large enough to push the aluminum ring upward, and how come it goes up?
thx a lot.
v= r x omega
= (39 ft) x (0.022 rev/s) x ( 2 pi / 1 rev)
=5.391 ft/ s
mu x m x g = m x v^2 / r
mu x g = v^2/ r
(0.36) (32 ft/s^2) = (5.391 ft/s) ^2 /r
r= 2.5 ft
but the answer if 15.7
I have set up an equation like this:
v= r x omega
mu x m x g = m v^2 /r
but I didn't get the answer, which is 15.7.
Is the setting right? If not, can anyone show me the right steps?
thx!